Oracle查詢

Question

我有表A和COL1，數據COL2作爲

col1 col2 
----------- 
1  x 
2  x 
3  x 
1  y 
2  y 
3  y 
4  y 
1  z 
2  z 

我想輸出：

col1 col2 
----------- 
1  x 
2  x 
3  x 
4  x 
1  y 
2  y 
3  y 
4  y 
1  z 
2  z 
3  z 
4  z 

即使值不存在在COL2在最大值COL1即「4」查詢應顯示多達4

Answer 1

SELECT A.col1, B.col2 
FROM (SELECT DISTINCT col1 FROM YourTable) A 
CROSS JOIN (SELECT DISTINCT col2 FROM YourTable) B 

Answer 2

如果你想在col1和COL2值的每個可能的組合的笛卡爾積：

Select col1, col2 from 
(select distinct col1 from sourcetable) as t1 
Cross join 
(select distinct col2 from sourcetable) as t2